Polio is caught from an infected person’s virus, not something that just appears on its own.

Main ways you get polio

  • Fecal–oral route : The poliovirus is shed in an infected person’s stool (poop), and another person gets infected when tiny amounts of that contaminated stool get into their mouth. This can happen through unwashed hands, contaminated food, or unsafe water.
  • Close contact: Caring for or living closely with someone who has polio, especially in places with poor handwashing or sanitation, increases risk because surfaces, toys, or hands can carry the virus to another person’s mouth.
  • Droplets (less common): The virus can also spread through droplets from coughs or sneezes, then entering someone else’s mouth. This route is possible but less common than fecal–oral spread.

Conditions that raise the risk

  • Poor sanitation: Areas without safe toilets, clean water, or regular handwashing see more fecal–oral spread.
  • No or incomplete vaccination: People who are not fully vaccinated against polio are much more likely to get sick if exposed to the virus.
  • Close crowding: Households or communities with many people in close quarters make person‑to‑person spread easier.

What polio does after infection

  • Entry and early infection: The virus usually enters through the mouth and first infects cells in the throat and intestines.
  • Silent spread: Many infected people have no symptoms at all but can still shed the virus in stool for weeks and infect others.
  • Severe disease (less common): In a small percentage of infections, the virus reaches the nervous system and can cause paralysis, breathing problems, and sometimes death.

Who is most at risk today

  • Unvaccinated children and adults in areas where polio still circulates or where vaccination coverage has dropped are at the highest risk of getting polio.
  • International spread is still considered a public health emergency, so travel to or from countries with circulating poliovirus can carry some risk for unvaccinated people.

Prevention basics

  • Routine polio vaccination is the key protection; fully vaccinated people are very unlikely to get polio, even if exposed.
  • Safe water, proper sewage systems, and consistent handwashing with soap after using the toilet and before eating sharply reduce transmission.

Information gathered from public forums or data available on the internet and portrayed here.